Working with Templates
- 19 Nov 2021
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Working with Templates
- Updated on 19 Nov 2021
- 1 Minute to read
- Print
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Templates can be created and used at different levels of configuration:
- Tag level: Tag templates and device templates containing tags.
- Communications level: Templates for communication clients (Modbus, OPC, Siemens, etc.) including preliminary configuration of the connection.
The Model tree for each section can be used to instantiate templates and provide the values for Custom Properties, assigning different values for each instance.
This User Guide assumes a basic understanding of Object-Oriented paradigm.
Custom Properties
In order to use the templates, it is possible to create Custom Properties within each template to be used as parameters. Custom properties are what differentiate instances derived from the same template. These Custom Properties can then be referenced in the Expressions to calculate specific values for each instance. Custom properties are referenced in the Expressions using the name of the Custom Property in curly braces { }.
Expressions
JavaScript expressions can be used on each data entry to calculate the value. All expressions start with “=” (like in spreadsheets). Expressions are only evaluated during the start-up of the module.
Examples of expressions assuming the following Custom Properties:
| Custom Property Name | Type | Value |
|---|---|---|
| Boolean01 | Boolean | True |
| Boolean02 | Boolean | False |
| Number01 | Number | 5 |
| Number02 | Number | 25 |
| Text01 | Text | Hello |
| Text02 | Text | World! |
| Action | Expression | Result |
|---|---|---|
| Concatenation | ={Text01}+" "+{Text02} | Hello World! |
| Sum | ={Number01}+{Number02} | 30 |
| Conditional | ={Boolean01}==1?{Number01}:{Number02} | 5 |
| Conditional | =['A','B','C','D','E'][{Number01}-2] | D |
| String methods | ={Text02}.substr(0,1)+{Text01}.slice(1,4) | Well |
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